Stitch-forming device.



Mmm

o. E. BROWN. STITCH FORMING DEVICE.

APPLICATION FILED OCT-19 1911.

PatentedSept. 7, 19.15.

. 3 SHEETS-SHEET I.

0. E. BROWN.

STITCH FORMING DEVICE.

APPLICATION mso ocT.19. 1911.

LMQAW. Patentedsept. 7, 1915.

3 SHEETS-SHEET 2.

4%, www .1 Arm/mfr d@ "PAN loTIs E. BROWN, or :BRocKToN, MASSACHUSETTS, Assis-NOR To THE SINGER MANUTAC- TURTNG COMPANY, A CORPORATION or NEW JERSEY.

STITCH-FRMING- DEVICE.

Mamas.

Specification of Letters Patent.

Patenten sept. a, Tais.

Appucation flied october 19, 1911. serial No. 655,519.

To all "whom, 1' t may concern Be it known that I, O'rrs E. BROWN, a citizen of the United States, residing at Brockton, in the county of Plymouth and State of Massachusetts, have invented certain lnew and useful Improvements in Stitch-Forming Devices, of which the following -is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in the means for handling the upper thread in sewing machines, and particularly in those employing af'barbed or open-eyed needley and a cooperating loop-taker mounted upon the. same side of the Work; and it has for its object to Iprovide effective means for laying vthe upper thread in the needle-eye in each stitch-forming cycle and insuring the proper presentation ofthe same for seizure by the loop-taker.

In its preferred form, the machine is constructed with a laterally jogging needleframe disposed beneath the Work-support and having journaled therein a reciprocating needle-bar carrying the open-eyed needle, and the threading implement comprises an eyed member and a forked member spaced therefrom, both being sustained for independent adjustment upon `a pivotally mounted carrier to which are imparted bodily lateral movements and oscillating movements for communicating to the threading implement successively operative movements transversely to and substantially within the direction of the jogging movements of the needle for placing the upper thread within the needle-throat. The threading-implement actuating-means are so connected with and controlled by the needle-frame yjogging means, by means of which lateral feeding movements are imparted to the needle, that the operative movements of the threadingimplement in the direction of feed correspond with the length of the feeding move-A ments of the needle for all adjustments of the feeding mechanism. rhen the needleeye and the path of movement of the looptaker beak are arranged in parallel planes, a loop-spreader, preferably mounted upon the needle-frame, is provided for carrying one limb of a needle-thread loop drawn through the Work bythe needle for presentation for passage'of the loop-taker beak.

The invention willbe understood by reference to the accompanying drawings, in Which- Figure 1 is a side elevation, with the frame in section, representing a Wax-thread machine embodying the present improvements and constructed substantially in accordance with my application 651,556, filed Sept. 27, 1911, and my Patent No. 1,097,389, of May 19, 1914; and Fig. 2 is a front end elevation of the same. Fig. 3 is a plan of certain parts of the machine with the frame omitted and Fig. 4 an enlarged perspective View of the parts of the stitch-forming devices below the work-support. Fig. 5 is a perspective view of the two-member threading-implement and its carrier, and Figs. 6 and 7 are detail views of the same partly in section upon diiferent planes. Fig. 8 is a perspective View of a portion of the feeding mechanism, and Fig. 9 an enlarged perspective view showing the relative positions of the upper-thread -handling devices When the descending needle is near its extreme upper position. Fig. 10 is a perspective view of a portion of the needle-threading mechanism.

The frame is shown constructed with the hollow base 1, the tubular standard 2 and the hollow overhanging arm 3 formed With the head 4 and having journaled therein the main-shaft 5 carrying the balance-Wheel 6 and belt-pulley 7. The main-shaft has fixed thereon by means of the set-screw 8 the hub 9 of the needle-actuating eccentric 10 embraced by the strap 11 and connected through the pit-man 12 with one arm of the rocker 13 having a second arm 14 connected by means of the pitman 15 with a crank carried by the needle-actuating rock-shaft 16. The rock-shaft 1G carries at its forward end a crank-arm 17 connectedby the pitman 18 with Va collar 19 fixed upon the needle-bar20 carrying the barbed or open-eyed needle 21 and journaled in thcbearing bosses 22x of the jogging needle-frame 22. The needle reciprocates through the usual aperture in the throat-plate tuated by means of the driver 29 which is in practice secured upon the carrier 30.

journaled in the holder 27 and provided with the peripheral gear-teeth 31 meshingy with a'driving gear 32 fixed upon the forward end of the shuttle-driver shaft 33 which is journaled in suitable bearings of the bed 1 and carries a bevel pinion 31 meshing with the larger bevel-wheel 35 Vfixed upon the upright shaft 36 within the standard 2 and carrying at its upper end a bevel-pinion 37 meshing with a similar pinion 38 fixed upon the main-shaft 5. By the means just described, the shuttle receives two rotations for each rotation of the main-shaft and for each reciprocation of the needle.

The feeding mechanism of the present machine is similar to that shown and described in my Patent No. 1,002,217, of September 5, 1911, and comprises a swinging lever 39 having a forked rearward end '-10 embracing'the feed-actuating cam 11 fixed upon the upright. shaft 36 and carrying at its upwardly offset opposite end a screwstud 42 having a ball at one end embraced by the recessedbearing washers 13 disposed between and journaled upon the adjacent faces of the yoke members t4 of a crankarm i5 whose hub 46 is fixed upon the feed rock-shaft 47 journaled within and longitudinally of the base 1. To prevent the endwise movement of the lever 39, the latter is provided With a depending stud 48 embraced by one end of a lilik 19 whose opposite end embraces the reduced lower end of the upright shaft 36. The opposite faces of the lever 39 are formed intermediate the ends of thelatter with segmental seats or guideways 39X entered by the points of screw-studs 50 carried by the yoked central portion 51 of the fulcrum-carrying lever 52 which is journaled upon the fulcrum-screw 53 sustained by `the base 1. In practice the points of the screw-studs 50 enter slideblocks fitted within'the gideways 39X, as shown and described in my said Patent No. 1,002,217. r1`he stud-screws 50 afford a fulcrum for the lever 39, and by shifting the lever 52 upon its fulcrum-stud 53 and varying the distance of the fulcrum 5() from the Aactuating eccentric al thethrow of the screw-stud 42, and consequently the degree of oscillation of the feed rock-shaft -17 may be varied. The outer end of the fulcrumcarrying lever 52 is formed with a fork in which is pivotally mounted the catch-lever 51 pressed outwardly by a spring 55 secured upon the lever 52 so as to retain a tooth 51* upon its lower end normally in operative relation with a toothed sectorplate 56 secured upon the based. By suitably operating the catch-lever 51 its tooth y51X may be disengaged from the sector-plate 56 and the yfulcrum-lever 52 shifted for adjustment of the length of feed.

The rock-shaft 17 is provided with an upwardly extending arm 57 having a transverse tubulaiboss entered by the stud-pin 58 tapped into the threaded aperture 59 in a lateral lug 60 of the needle-frame 22. At its opposite edge the needle-frame has a split lug 61 carrying a stud-bolt 62 passing through a slot 63 in the guide member 61 formed in its rear side with a guideway to receive the slide-block 65 entered by the stud-bolt 62. The guide-member 61 is formed at the upper end of an arm 66 rigidly secured upon the front end of the base l'by suitable means.

Journaled in a rearwardly extending lug 67 of the bracket-arm head 1 is the vertically disposed threader rock-shaft 68 having rigidly secured upon its lower end the lateral crank-arm 69 carrying the stud 70 which enters a boss 71 of the swinging threader-carrier 72 which is provided with a second boss 73 embracing a stud-pin 7-1 arried by a crank-arm 75 attachedto the lower end of a rock-shaft 76 also journaled in the head of the bracket-arm. The rockshaft 76 carries a lateral crank-arm 77 having journaled therein the stud-pin 78 whose head 79 is formed with a transverse aperature in which is secured the inwardly bent extremity 80x of the pitman-rod 80 having secured upon its opposite end the yoke 81 carrying the alined center-sciews 82 upon which is journaled the oscillating tubular bearing sleeve 83. Fitted within the bearing sleeve 83 is the rod 81 whose shouldered and threaded rearward end is tapped into the arm 85 rigidly attached to the vertical rock-shaft 86 which is provided with a second rigid arm 87 carrying the roller-stud 88 entering the cam-groove 89 of the cam-disk 90 whose hub 91 is secured by set-screws 92 upon the vertical shaft 36. The yoke 81 is provided with a second pair of center-screws 93 ati'ording fulcra for the transverse hub 91 at one end of a pitman-rod 95 whose opposite end is adjustably secured in the collar 96 pivotally connected by means of the pin 974 with a lateral crank-arm 98 upon the vertical rockshaft 99 having at its lower end the crankarm 100 pivotally connected by the pin 101 with the rearward end of the bent link 102 having its opposite end pivotally connected by means of the stud-screw 103 with'the fulcrum-lever 52. It will be seen that the adjustment of the fulcrum-lever 52 to reguiaeaaea :d

late the length of feed will, by the connections just described, turn the shaft 99 soas to shift the connection of the rearward end of the pitman-rod 80 with the arm 85 of the rock-shaft 86, thereby simultaneously adjusting the throw of the threader-carrier under the action of it actuating cam 89.

The carrier 72 is shown provided with a depending forked lug 72x in which are adjustably secured the fastening ear 104 of the split socket 105 and the similar ear 106 of the split socket 107. The fastening ears 104 and 106 are pivotally mounted within the carrier-lug 72X upon the common studscrew 108, the former being secured in position thereon by means of the clamp-screw 109 passing through a slot 110 :in the adjacent member of the lug and being tapped into the ear 104, while the ear 106 is clamped adjustably against the inner face of the opposite member of the lug 72 by means of the set-screw 111. The adjusting screws are so applied tothe forked lug 72X that they are bothaccessible from the front face of the same.

Secured for endwise and circular adjustment in the socket 105 by means of the clamp-screw 112 is the shank of the eyed threading member 113 formed in its downwardly offset lower extremity with the thread-aperture 114, and within the split socket 107 is secured for similar adjustment by means of the clamp-screw 115 the shank of the forked threading member 116 whose downwardly o'sety lower end, laterally spaced from the apertured extremity of the eyed member 113 is formed with the threadreceiving notch 117, all as represented in F ig. 5. The split lugs of the sockets 105 and 1.07 are shown disposed in angular relation and the heads ofthe clamp-screws 112 and 115 are arranged at their forward faces, so as to be accessible for adjustment of the independently mounted members vof the threading implement from the front of the machine.

i It will be observed that the carrier 72 is journaled upon two stud-pins carried by independently mounted crank-arms 69 and 75, and thus acts as a link connection between the same. The parts are so related and actuated by the described connections with the actuating caln 89 that in the initial oscillatory movement of the rock-shaft 7G the carrier 72 is carried bodily forward until the stud reaches a position substantially in alinement with the rock-shaft 76 and stud-pin 74, when its advance transversely to the direction of feed of the needle is nearly arrested and the carrier is caused to swing upon the stud 70 in a direction substantially parallel with the needle-feeding movements. The primary advance movement of the spaced threading members causes the movement of the strand of thread tioned, when only a single eyed threaderarm is employed, the operative movements of the latter may be controlled to corre- Y spond with the amplitude of feeding movements of the needle, so that the traverse of the threader is maintained at a minimum for all adjustments of the feeding mechamsm.

Journaled in the bracket-arm head 4 is the verticali thread-controller rock-shaft 118- carrying at its lower end. the bent threadcontroller arm 119 formed at its outer end with a thread-engaging l1ook119x adapted to catchthe needle-thread n extending between the work and the eye 114 of the threader-arm 113 and draw the same backwardly over the fixed and horizontally arranged thread-finger 120 in a substantially horizontal direction into the fork 117 of the threader-arm 116, as represented in Figs. 1 and 9. rl`he rock-shaft 118 carries at its upper end -a crank-arm 121 in which is journaled the pin 122 having a head 123 formed with a transverse aperture in which is secured the forward end of a pitman-rod 124 whose opposite end is similarly secured in the head 125 of a lpin 120 journaled in the outer end of a lever 127 mounted upon the fixed fulcrum 128 sustained by the bracketarm and carryingintermediate its ends a roller-stud 129 adapted to enter the actuating cam-groove 130 in the cam-cylinder 131 fixed upon the main-shaft The controller-arm 119 is so actuated by the cam 130 that itA performs its operative thread-engaging movement just as the threader begins its advance needle-threading movement, seizing the slack thread given up by the take-up and laying the upper limb of the loop which it carries within the fork 117 of the threader-arm 11G, and continuing its operative movementuntil it has drawn out all the slack needle-thread. The controller-arm begins its return movement as the needle commences its descent. and gives up slack for the needle proportionate .to the requirements of the latter during Aits descent through the work, so as to prevent the rendering of thethread through the needleeye and liability to breakage at such time. During the return movement of the controller arm and thedescent of the needle the eyed threader member 113 remains inactive so as to avoid any unnecessary pull upon 135 embraced by the lower end of a link 136 whose upper end is entered by the stud 137 carried by the angle-lever 138 fulcrumed at 139 and carrying the roller-stud 140 which is adapted to enter lthe cam-groovev141 in f the cam-cylinder 142 fixed upon the mainshaft 5. The needle-thread is led from the source of supply over certain guide-rollers mounted respectively upon and independently of the take-up lever 132 and finally v overthe guide-roller 132x at the forward eX- tremity of said lever and thence downwardly over a iXed guide-roller 143 and through the aperture 114 of the threader-arm 113 to the work, as represented in Figs. 1 and 9.

The material 'm is punctured for each stitch preparatory to the upward thrust o'r'l the needle for seizure of the upper thread by means of the awl 144 carried by reciprocating aWl-bar 145'journaled in the head 4 of the bracket-arm. The material is pressed upon the work-support by the presser-foot 146 carried by the usual presserbar journaled in the bracket-arm head 4 and provided with means for automatically lifting it preparatory to each lateral feeding movement of the needle occurring while the needle is in substantially its highest position.

Journaled in suitable bearing bosses 147 of the needle-frame 23 is the spreader-shaft 148 disposed substantially parallel with the needle-bar and formed at its upper end with a collar 149 in which is secured by means of the'set-screw 150 the shank of the loopspreader 151 whose laterally offset upper end 'is formed with a thread-,engaging hook 152. The shaft 148 has secured up on its lower end the hub of a crank-arm 153 whose eyed outer end embraces the stud -154 secured in the apertured and split forward end of the pitman 155 in whose similarly split rearward end is secured the pin 156 entering an apertured boss 157 at the outer end of a lever 158 having. at itsopposite end a boss 159 into which is tapped the threaded lower end of the stud 160 formed with conical journals mounted in bearing bosses 161 upon the inner wall of the base 1. The lever 158 carries intermediate its ends the roller-stud 162 lwhich enters the groove 163 of the camcvlinder 164 fixed upon the needle-actuating rock-shaft 16. The horizontal vibratory movements imparted by the cam 163 to the lever 158 are transmitted through the described connections to the spreader rockshaft 148 and are communicated by it to the thread-engaging hook 152 of the spreader which moves in a path close to but. at one side of the needle-path and serves to seize one limb of a thread-loop drawn down through the material by the needle and to spread the same near the inner face of the throat-plate 23 transversely of the plane of movement of the loop-taker beak 242 to enable the latter to enter the loop for the loopcasting operation, as represented in Fig. 4.

While the loop-spreader may be mounted and actuated in any manner suitable to enable it to perform its described function, in machines in which the needle has a lateral feeding movement it is desirable that siderably varied withinthe scope of the invention.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, the combination with a reciprocating open-eyed needle, and a. loop-taker cooperating therewith, of a threading implement for inserting the upper thread in the needle-eye in each stitchforming cycle, a carrier for said threading implement, a movable fulcrum for said carrier, and actuating means for the carrier whereby the latter in one stage of its movement acts to change the position of its fulcrum and 'in a second stage of its movement swings upon said fulcrum as an axis.

2. In a sewing machine, the combination with a reciprocating open-eyed needle, and a loop-taker coperating'-therewith, of a threading implement comprising spaced eyed and forked members adapted for inserting the upperthread in the needle-eye in each stitch-forming cycle, a swinging carrier in which the component members of said threading implement are mounted for relative adjustment, an actuating cam, and an operative connection between the actuatingcam and said carrier.

3. In a sewing machine, the combination with a reciprocating open-eyed needle, and a loop-taker coperating therewith, of a threading implement comprising spaced eyed and forked members adapted for inserting the upper thread in the needle-eye in each stitch-forming cycle, a swinging carrier, sockets sustained by and relatively adjustable upon said carrier and each proopen-eyed needle. a laterally jogging frame 1n which the needle-bar is mounted, and a loop-taker cooperating with theneedle, of a threading implement mounted independently of said jogging frame and adapted for laying the upper thread in the needle-eye in each stitch-forming cycle, feeding mechanism connected with said frame for imparting to the needle lateral work-feeding movements, feed-regulating means for determining the range of lateral feeding movements of the needle, actuating means for said threading implement, and means for varying the operative movements of the threading implement to correspond with the range of feeding movements imparted to the needle.

5. In a sewing machine, the combination with a reciprocating and laterally jogging needle-bar, needle mounted therein and formed with an eye open on one side and arranged in the direction of lateral jogging movements of the needle-bar, and a looptaker coperating with said needle, of a threading implement comprising spaced thread-holding members movable successively transversely of the jogging movements of the needle-bar and then substantially in the same direction-therewith and in paths upon opposite sides of the needle and adapted for laying the upper thread in the needle-eye in each stitch-forming cycle, feedactuating mechanism from which lthe needlebar derives the said jogging movements, feed-regulating means for determining the range of lateral jogging movements of the needle-bar, actuating means for said threading implement, and means for varying the operative movements of the threading implement to correspond with the range of feeding movements imparted to the needle.

6. In a sewing machine, the combination with a reciprocating open-eyed needle and a loop-taker coperating therewith, of` a threading -implement for inserting the upper thread in the needle-eye in each stitchforming cycle, a carrier for said threading implement, two parallel rock-shafts, a crank-arm upon each of said rock-shafts pivotally connected with and adapted to support said carrier, and means connected with one of said rock-shafts for actuating of operative relation with said,

the same and through said carrier the other of said rock-shafts.

7. 'In a sewing machine, the combination with a Work-support, a reciprocating openeyed needle, and a loop-taker coperating therewith, of a threading implement comprising spaced eyed and forked members having a path ofmovement confined to a single plane transverse to the path of reciprocation of said needle, a vibratory threadcontrolling member mounted upon a' fixed fulcrumv and adapted to engage the thread between theeyed threading member and the work-support and lay it in the fork of the other threading member, means for actuating said threading members for inserting the thread in the needle-eye, and actuating means for said thread-controlling member.

8. In a sewing machine, the` combination with a. reciprocating needle-bar carrying an open-eyed needle, a cooperating loop-taker provided with a loop-seizing beak, and a laterally joggin frame in Which said needlebar is journale to reciprocate, of a threading implement movable toward and from the path of movement of said needle and adapted to lay the upper thread in the needle-eye, a loop-spreader mounted upon and sustained by said`laterallyjogging frame and adapted to seize a limb of the loop of thread drawn through the `work by the needle and distend the same across the path of movement of the loop-taker beak, and means for actuating said loop-spreader.

9.' In a sewing machine, the combination with a work-support, a reciprocating open eyed needle, and a loop-taker coperating therewith, of an eyed threading implement movable in a single plane transverse to the path of reciprocation of the needle, means for moving said implement into threading position and for retracting the same after an interval of inaction during the movement of the threaded needle through the work, a vibratory thread controlling member mounted upon a fixed fulcrum and movable intermediate the work-support and said threading implement and adapted to coperate with the latter in laying the thread in the needle-eye and adapted thereafter to release thread during the interval of inaction of the threading implement, and actuating means for said thread controllingmember.

In testimony whereof, I have signed my name-to this specification, in the presence of two subscribing Witnesses.

O'IIS E. BROWN.

Witnesses:

I-I. J'. MILLER, Il. A. KOR'NEMANN, Jr. 

